﻿//  Copyright 2016, 2017 Google Inc. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

using NtApiDotNet;
using System.Management.Automation;

namespace NtObjectManager.Cmdlets.Object
{
    /// <summary>
    /// <para type="synopsis">Assign a process to a Job object.</para>
    /// <para type="description">This cmdlet assigns a process to a Job object.</para>
    /// </summary>
    /// <example>
    ///   <code>Set-NtProcessJob -Job $job -Process $process</code>
    ///   <para>Assigns the process to the job object.</para>
    /// </example>
    /// <example>
    ///   <code>Set-NtProcessJob -Job $job -Current</code>
    ///   <para>Assigns the current process to the job object.</para>
    /// </example>
    /// <para type="link">about_ManagingNtObjectLifetime</para>
    [Cmdlet(VerbsCommon.Set, "NtProcessJob", DefaultParameterSetName = "FromProcess")]
    public sealed class SetNtProcessJobCmdlet : PSCmdlet
    {
        /// <summary>
        /// <para type="description">Specify the job object.</para>
        /// </summary>
        [Parameter(Mandatory = true, Position = 0)]
        public NtJob Job { get; set; }

        /// <summary>
        /// <para type="description">Specify the list of processes to assign.</para>
        /// </summary>
        [Parameter(Mandatory = true, Position = 1, ValueFromPipeline = true, ParameterSetName = "FromProcess")]
        public NtProcess[] Process { get; set; }

        /// <summary>
        /// <para type="description">Specify the list of processes to assign.</para>
        /// </summary>
        [Parameter(Mandatory = true, ParameterSetName = "FromCurrent")]
        public SwitchParameter Current { get; set; }

        /// <summary>
        /// <para type="description">Specify to pass through the process objects.</para>
        /// </summary>
        [Parameter(ParameterSetName = "FromProcess")]
        public SwitchParameter PassThru { get; set; }

        /// <summary>
        /// Overridden ProcessRecord method.
        /// </summary>
        protected override void ProcessRecord()
        {
            if (Current)
            {
                Job.AssignProcess(NtProcess.Current);
            }
            else
            {
                foreach (var proc in Process)
                {
                    try
                    {
                        Job.AssignProcess(proc);
                    }
                    catch (NtException ex)
                    {
                        WriteError(new ErrorRecord(ex, "AssignJob", ErrorCategory.QuotaExceeded, proc));
                    }

                    if (PassThru)
                    {
                        WriteObject(proc);
                    }
                }
            }
        }
    }
}